Electromagnetic device



March 30 1926.

H. C. HARRISON ELECTROMAGNETIC DEVICE Filed Nov. 16, 1923 Patented Mar. 30, 1926.

UNITED STATES OFFICE.

HENRY G. HARRISON, OZE PORT WASHINGTON, NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, NEW YORK.

OF NEW YORK, N. Y., A CORPORATION OF ntncrnotmennrio DEVICE.

Application filed November 16, 1923. Serial No. 675,090.

To all whom it may concern:

Be it known that I, HENRY C. HARRISON, a

citizen of the United States of America, re-

' relatively moving contact surfaces and torsional strains.

In accordance with the general features of the invention, there is provided an armature having a plurality of rod like members parallel to its axis of rotation from which the armature is suspended by means of a plurality of resilient members attached to a support.

In one'embodiment of the invention the armature is provided with an axial member, from each end of which projects four short rods or studs parallel to the axis of rotatlon and symmetrically disposed with respect thereto and supported by means of thin strips of metal passing around each stud, both ends of each strip being attached to a support whereby the forces restoring the armature are produced by stre s in these strips.

Referring to the drawing, 1 1 shows a the tensional phonograph reproducer embodying the inrention. I

Fig. 2 is a cross sectional view on the line 22 of Fig. 1.

l ig. 3 is a cross sectional view of the armature support. l

Fig. l a longitudinal view throughthe armature support.

For the purpose of illustrating the applica ion of the invention, it is shown as ap lied to an electromagnetic rcprodncer ui-h as disclosed in Patentllo. 1281,62 3 of X0 \cmhcr 1Q, .1918, to H. C. M ton. in armature 3? of magnetic material is secured intermediate its ends lo an axial member 38.

I in cach'end of which are fitted and secured in any suitable manner such as soldering, four rods 5 extending parallel and symmetrical to its axis. The outer ends of the rods 5 may be secured by small disc 6 which. may be perforated to receive them.

Supports 41. for holding armature 37 .in operative relation to the electromagnet 15 are provided with perforations 8 in each of which is secured a. cylindrical bushing 9 having four longitudinal grooves in its inner surface at substantially 90 apart. In these grooves are fitted four light flexible members 16 made of brass or copper foil or other suitable material bent at'substantially 90, the ends of each flexible member being secured in the grooves spaced 90 apart. If preferred these four resilient members may be made by folding one sheet of material back and forth upon itself. Each of the rods 5 project throughthe cylinder 9 and lie snugly in the angle of one of the resilient members 16, and may be soldered thereto if desired. The length ofthe web members 16 will depend upon the maximum displace ment of the armature, the greater-the displacement the longer the members 16 should be. It will be seen from the construction herein described that all relatively moving contact surfaces which tendto produce rattle as in pivoted joints are dispensed with and the restoring force is provided mainly -by the tension introduced in the web-like members.

llhat is claimed is: 1. 'A mounting for oscillatory members comprising an axial member parallel to the axis of oscillation, a plurality of rods attached parallel to said axial member, asupport and resilient means securing said rods to saidsupport.

In an electromagnetic device, an armature, a mounting for said armature comprising a plurality of rods extending transverse said armature and secured thereto,a support, and means for suspending said rods from said support. 1

'3. In an electromagnetic device, an armature, a mounting for said armature compris-' 4. In an electromagnetic device, a vibratory. IHCD'EbQI, a mounting therefor, said mounting comprising an axial member secured to said vibratory member, a plurality of rods parallel to said axial member and carried thereby, a support, and a plurality of resilient members, each end of said members being attached to said support and each member carrying one of said rods.

5. In an electromagnetic device, a vibra tory member, means for supporting said vibratory member, said means comprising four parallel rods symmetrical with respect to the axis of said Vibratory member, a support, and suspension members having their ends attached to said support, each of said suspension -members carrying one of saidrods.

6. In an electromagnetic device, an oscillatory member, a hollow cylindrical support therefor having its axis in alignment with the axis of oscillation of said member, a

plurality of angular resilient members within and secured to said support, said resilient members having angular portions converging toward the center of said support and a plurality of rods lying in the angular portions of said resilient members and attached to said oscillatory member.

In witness whereof, I hereunto subscribe my name this 12thday of November, A. D 1923. v

HENRY o. HARRISON. 

